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This down-insulated sleeping bag has a less-tapered cut than a standard backpacking mummy bag, giving you more room to move around on your spring, summer and fall adventures.

  • Features

    • With a European Norm (EN) lower-limit rating of 20°F, the Furnace 20 is a versatile bag for 3-season backpacking adventures when temps might dip below freezing
    • 550-fill-power ProDown™ natural goose down insulation is light and lofty
    • ProDown™ is enhanced with a hydrophobic finish that improves warmth by allowing it to dry faster and repel moisture up to 10x longer than untreated down
    • Anti-compression pads made from Heatseeker™ Eco synthetic insulation are sewn into high-pressure areas that contact the ground to create an insulating buffer
    • Shaped hood and down-insulated draft collar hold in warmth
    • Insulated draft tube backs the zipper to prevent warm air from escaping; antisnag tape keeps the zipper from catching on the draft tube
    • 3/4-length, 2-way zipper lets you make adjustments for ventilation
    • Comfort-oriented shape has a less-tapered cut than some backpacking sleeping bags, allowing you more room to move around
    • Footbox allows natural foot movement while also eliminating excess lateral space so you stay warm and comfortable all night long
    • The North Face Furnace 20 Sleeping Bag comes with a standard stuff sack


    Many sleeping bags are rated for temperature by an independent testing protocol. With both European Norm (EN) 13537 and International Organization for Standardization (ISO) 23537 testing, each bag gets a Comfort (or T-Comfort) rating and Lower (or T-Limit) rating. The Comfort/T-Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower/T-Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Ratings are based on a person wearing one long underwear layer and a hat, sleeping on a single 1 in. thick insulating pad. Many brands use the Comfort rating for women's bags and the Lower rating for men's and unisex bags. Everyone's body and sleep comfort differ, so EN and ISO ratings are simply a guideline to help you compare products.
    View all The North Face Men's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    20 degrees (F) - EN

    Tested Comfort

    34 degrees (F) - EN

    Temperature Rating (F)

    20 degrees (F)

    Temperature Rating (C)

    -7 degrees (C)



    Zipper Location


    Insulation Type


    Water-Resistant Down



    550-fill goose down



    Sleeping Bag Shape


    Stuff Sack Size

    9 x 17 inches

    Stuff Sack Volume

    20 liters

    Compressed Volume

    6.6 liters



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